we need to require yaml even if we have psych
we need to require yaml even if we have psych

fixes #1441
ngpestelos/bundler,JuanitoFatas/bundler,ipmobiletech/bundler,zhangkuaiji/bundler,steved/bundler,simplybusiness/bundler,Elffers/bundler,pjump/bundler,patvice/bundler,mvz/bundler,danimashu/bundler,ximus/bundler,robinboening/bundler,cstrahan/bundler,ligi/bundler,haonature/bundler,roseweixel/bundler,haonature888/bundler,Teino1978-Corp/Teino1978-Corp-bundler,gregkare/bundler,joshsoftware/bundler,jingweno/bundler,ipmobiletech/bundler,mpapis/bundler,asymmetric/bundler,haonaturel/bundler,wenderjean/bundler,joshsoftware/bundler,bundler/bundler,chef/bundler,suhastech/bundler,carpodaster/bundler,asymmetric/bundler,philnash/bundler,byroot/bundler,Eric-Guo/bundler,tgxworld/bundler,kohgpat/bundler,gentoo/bundler,EthanK28/bundler,carpodaster/bundler,EasonYi/bundler,AiyionPrime/bundler,mattbrictson/bundler-1,dilumnavanjana/bundler,nju520/bundler,frsyuki/bundler,sideci-sample/sideci-sample-bundler,suhastech/bundler,AiyionPrime/bundler,twcctz500000/bundler,chulkilee/bundler,davydovanton/bundler,EthanK28/bundler,jaym/bundler,eagletmt/bundler,EasonYi/bundler,patvice/bundler,mdorrance/bundler,bronzdoc/bundler,frsyuki/bundler,h4ck3rm1k3/bundler,ligi/bundler,Eric-Guo/bundler,philnash/bundler,Wirachmat/bundler,steved/bundler,anil826/bundler,byroot/bundler,anil826/bundler,jingweno/bundler,mattbrictson/bundler-1,ngpestelos/bundler,sideci-sample/sideci-sample-bundler,CorainChicago/bundler,Teino1978-Corp/Teino1978-Corp-bundler,mvz/bundler,roseweixel/bundler,asutoshpalai/bundler,lmtim/bundler,pivotal-cf-experimental/bundler,elovelan/bundler,schaary/bundler,bundler/bundler,Wirachmat/bundler,masarakki/bundler,simplybusiness/bundler,pivotal-cf-experimental/bundler,schaary/bundler,asutoshpalai/bundler,robinboening/bundler,rkh/bundler,RochesterinNYC/bundler,Elffers/bundler,TimMoore/bundler,tgxworld/bundler,PG-kura/bundler,r7kamura/bundler,nju520/bundler,christer155/bundler,mpapis/bundler,elovelan/bundler,vemmaverve/bundler,chef/bundler,jaym/bundler,smlance/bundler,jasonkarns/bundler,mdorrance/bundler,seanlinsley/bundler,lmtim/bundler,cstrahan/bundler,PG-kura/bundler,cdwort/bundler,seanlinsley/bundler,kohgpat/bundler,agis-/bundler,masarakki/bundler,davydovanton/bundler,dilumnavanjana/bundler,chulkilee/bundler,agis-/bundler,zhangkuaiji/bundler,gregkare/bundler,1337807/bundler,cdwort/bundler,haocafes/bundler,ximus/bundler,christer155/bundler,danimashu/bundler,smlance/bundler,bronzdoc/bundler,neslom/bundler,neslom/bundler,e2/bundler,wenderjean/bundler,RochesterinNYC/bundler,jasonkarns/bundler,h4ck3rm1k3/bundler,TimMoore/bundler,CorainChicago/bundler,pjump/bundler